Fly ash-based cemented filling material and preparation method thereof
A technology for filling materials and fly ash, which is applied in the field of filling materials for mining and their preparation, can solve the problems of high cost, slow solidification, low top connection rate, etc., and achieves the effects of easy operation, significant growth, and reduction of initial investment.
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specific Embodiment approach 1
[0020] Specific Embodiment 1: In this embodiment, the fly ash-based cemented filling material consists of 450-485 parts by mass of waste fly ash, 705-725 parts of underground waste water, 15-20 parts of activator, 4-6 parts of lime, 32 ~40 parts of desulfurized gypsum, 11~14 parts of early strength agent, 90~112 parts of sulphoaluminate cement and 128~148 parts of composite portland cement;
[0021] Wherein said activator is one or more mixtures of desulfurized gypsum, alum, water glass and slaked lime;
[0022] The accelerator is Na 2 CO 3 、NaNO 2 、Na 2 SO 4 , Li 2 CO 3 , Li 2 SO 4 , one or more mixtures of triethanolamine.
[0023] In this embodiment, when the activator and early strength agent are a mixture, each component can be mixed in any ratio.
[0024] In this embodiment, the fly ash is activated by an activator, and the activated fly ash and an appropriate amount of composite Portland cement can replace part of the sulphoaluminate cement, reducing the cost ...
specific Embodiment approach 2
[0025] Embodiment 2: This embodiment differs from Embodiment 1 in that the sieve allowance of fly ash with a 45 μm square hole is less than or equal to 45%. Other raw materials are the same as in Embodiment 1.
[0026] The waste fly ash used in this embodiment is dry-discharged or wet-discharged fly ash, which is low-calcium ash.
specific Embodiment approach 3
[0027] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the pH value of the downhole wastewater is 5-14, and the particle size of solid impurities in the wastewater is not greater than 2 cm. Other raw materials are the same as in Embodiment 1 or 2.
[0028] The underground wastewater used in this embodiment is coal mine underground water or metal mine underground water that cannot be directly utilized.
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